Sewing-machine



(No Model.) 2 Sheets-Sheet 1-.

L. O. MGALLISTER.

SEWING MAGHINE.

No. 278,809. Patented June 5,1883. *3 7 9v.

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(No Model.) 2 Sheets-Sheet 2.

L. C. MOALLISTER. 4 I SEWING MACHINE. i No. 278,809. Patented June 5,1883.

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UNITED STATES PATENT OFFICE.

LEWIS c. MOALLISTEB, or FORT-W T TEXAS- SEWING-MACHINE.

SPECIFICATION forming part of'Ltters Patent No. 278,809, dated June 5, 1883'.

Application filed July 31, 1882. (X model.)

To all whom it may concern Be it known that I, L. O. .MOALLISTER, a citizen of the United States, residing at Fort \Vorth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Sewing-Machines, of which .the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in that class of sewing-machines wherein the shuttle rotates instead of reciprocating; and it consists in the arrangement and construction of the shuttle, bobbin, and shuttle-thread con- :troller, whereby the shuttle-thread at a certain time in each revolution of the shuttle is rewound upon the bobbin, which prevents the thread from twisting or untwisting, all of which will be more particularly described hereinafter, and set forth in the claims.

sewing-machine.

In the drawings, Figure 1 is a plan view of a sewing-machine with the bed-plate removed to show the parts of the machine below it. Fig. 2 is a vertical projection on line as m of Fig. 1. Fig. 3 is a vertical projection on line y y of Fig. 1. Fig. 4 represents, in four diagrams, a modification of the thread controller as shown in Fig. 1, to show the relative positions of the needle, the thread-controller, and the shuttle giving off the thread-from the bobbin. Figs. 5 and 7 are different views of the shuttle and bobbin. Fig. 6 is an elevation of a sewing-machine, partly in section, showing the manner of operating the shuttle-shaft. Fig.8 is an enlarged section of the bobbin and spring tension-bar. Fig. 9 is a perspective view of the shuttle holder or carrier.

A A represent the frame of any ordinary In Fig. l the plate is removed, leaving a portion, A, where the needle passes through.

A" in Fig. 1 is a cross-bearer, in which one end of the shaft B is sustained. It is understood that this shaft B may be supported in any convenient manner beneath the plate, so that its center is on a line with the center around which is the shuttle-race. Near the outer end of shaft B there is a crank, B, and wrist b Fig. 6, to which is coupled the connecting-rod H, which operates the needle-bar shaft 1.

bobbin is given or regulated,

On shaft B is the driving-pulley B, receiv ing motion, as usual, by a band from the drivingwheel. It is understood that this shaft B may be driven by various other means as well as by that herein described.

B on shaft B is an eccentric cam having an ,eccentrierod, b, which is connected to the arm 0 of a rocking shaft, 0, which is properly supported in the frame beneath the plate.

On the shaft C there is an arm, O and attached to it by a joint is a rod, D, which passes across-the frame and above the shaft B. On

this rod D is an arm, (1, at the end of which is a hook, d. This I call a thread-controller, as it takes up the slack thread and prevents it from twisting. V This rod D passes through a bearing at d", sliding through it .to and fro.

On shaft B, at its inner end, there is a crank,

B, which is on one side of the center of shaft B and secured to it. tached the shuttle-carrier E, which is of any convenient form, and in which rests the shuttle which is seen in Fig. 5. F is the shuttle-race,

as represented in front views in Fig. 4. In the carrier E there is a spring, 6, the function of which is to press the shuttle against the :race' F, and also to assist in keeping the bobbin in the shuttle. shown the sections of the shuttle and the means In Figs. 5, 7, and 8 are for supporting the bobbin within the shuttle, and the spring and at the same time serves to keep the bobbin from moving endwise, as by this movement endwise the bobbin would obstruct the upper thread when passing over the shuttle.

p G is a fiat plate, to which is hinged the hollow cover G. On plate G is a solid pin, and in the bobbin H there is a hollow spindle, h, which fits over pin g.. The upper plate, h, of H is a solid disk. The lower plate, h fits around the hollow spindle 71. When the bobbin H, with its complement of thread, which should not be too full, is to be placed on the pin 9, the spring g and plate y should be pressed back, and when the bobbin H is down the plate y will be caused by the spring 9 to press against the thread on the bobbin continuously. The cover G is pressed down upon the plate G, and isheld as the case of a watch is held, and is easily re-- To this crank B is at-' by which the tension on the moved when a new bobbin is to be put in.

The fastening of the shuttle-carrier to the crank B is made in any convenient and suitable manner for quick removal and replacing of a new bobbin when it is to be put in.

It is to be observed that when the bobbin is full the spring is compressed to its fullest extent, and the tension on the bobbin is at its maximum, and as the thread is used off the tension becomes gradually less. This is a compensating medium, for as the diameter of the thread on the bobbin is diminished the thread is tightened, because the bobbin has to revolve oftener to deliver a given quantity of thread. The thread-controller (Z also assists in thetension of the thread 011 the bobbin. the coiled spring, a flat spring may be used, and an adjusting-screw may be put in the piece g, which acts as a guide to the spring-stem.

Various methods may be used to press upon the thread as it diminishes upon the bobbin. It will be noticed that one end of the bobbin is closed, which insures the bobbin being always placed 011 the pin as it should be, that the thread will certainly unwind in the proper direction, as, when the thread-controller operates, the thread is carried back upon the shuttle, as will be explained.

In Fig. 4 are four diagrams representing an inside face view of the shuttle-race and a modification of the tlnead-controller, as shown and described in Fig. 1. The rod D, instead of passing across the main shaft and having a projecting hooked arm, (1 d, can be a rod with a hooked end, (7, and, as shown in No. 4 of I Fig. 4, be attached to the arm 0 of a rockershaft, 0, on the rear side of the frame, when the hooked end (1 will pull the thread instead of shoving it, as in Fig. 1, the operation upon the thread being precisely the same in both cases, as follows, viz:

Vhen the shuttle is at the point represented at No. 1 in Fig. 4, the thread comes from the .bobbin upward, and the thread-controller (Z has carried it to the right or rear of the bedplate A, the shuttle is about to pass to the left and through the loop of the upper thread, the needle being down and having formed said loop. In No. 2 the shuttle has passed through the loop to the leit or front of the bed-plate A, and the thi.-ead-controller d has also passed to the left or front, and the needle is above the bed-plate A, ascending. At No. 3 the shuttle is at its'lowest point and the thread-controller d is just beginning to move to the right or rear,

In place of carrying with it the shuttle-thread, and the needle is at its highest point, ready to descend. In No. 4. the shuttle is rising and the threadcontroller (I is passing to the right or rear with the slack thread from the shuttle, and the needle is descending, ready to take its position, as in No. 1, when the shuttle shall have also gained its position there. shuttle has made one revolution and formed the stitch by carrying the bobbin through the loop of the upper thread, the thread has been given off from the bobbin on the side opposite to the needle and carried back upon the bobbin just about the time the point of the shuttle enters the loop of the upper thread, and

the bobbin has unwound itself in a direction opposite to that traveled by the shuttle, and all tendency of the thread to twist has been counteracted by the thread having been kept tight and rewound onto the bobbin by the thread-controller.

So far as I know, I am the first to use a threadcontroller to aid in rewin ding the shuttle-thread on the bobbin, which rewinding prevents the shuttle-thread from being twisted or untwisted, and this feature I claim, and do not confine myself, primarily, to the use of the particular recipro eating threadcontroller shown, that being i only one practical form of my invention.

Iclaim- 1. In a rotaryshuttle sewing machine, a shuttle-thread controllerto aid in rewinding the slack thread upon the bobbin, substantially as and for the purpose described.

2. The combination of the rocker shaft 0 and arm C the rod D, and thread-controller d, substantially as and for the purpose described.

3.. In a sewing-machine shuttle having one end of the bobbin exposed, a tension-spring to press against the thread of the bobbin, near the inner plate, and arranged to follow the thread toward the spindle as the thread is used off the bobbin, and also to press against the inner plate of the bobbin, to prevent the bobbin from moving endwise toward its exposed end, leaving a sufficient space between the spring and the exposed end of the bobbin for rewinding the thread thereon, substantially as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

' LEVIS C. MCALLISTER. Vitnesses T. P. DAY,

H. N. CONNER.

In doing this the 

